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        <a href="../.." >JSON 对象</a>
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                                <section class="normal markdown-section">
                                
                                <h1 id="json-&#x5BF9;&#x8C61;">JSON &#x5BF9;&#x8C61;</h1>
<h2 id="json-&#x683C;&#x5F0F;">JSON &#x683C;&#x5F0F;</h2>
<p>JSON &#x683C;&#x5F0F;&#xFF08;JavaScript Object Notation &#x7684;&#x7F29;&#x5199;&#xFF09;&#x662F;&#x4E00;&#x79CD;&#x7528;&#x4E8E;&#x6570;&#x636E;&#x4EA4;&#x6362;&#x7684;&#x6587;&#x672C;&#x683C;&#x5F0F;&#xFF0C;2001&#x5E74;&#x7531; Douglas Crockford &#x63D0;&#x51FA;&#xFF0C;&#x76EE;&#x7684;&#x662F;&#x53D6;&#x4EE3;&#x7E41;&#x7410;&#x7B28;&#x91CD;&#x7684; XML &#x683C;&#x5F0F;&#x3002;</p>
<p>&#x76F8;&#x6BD4; XML &#x683C;&#x5F0F;&#xFF0C;JSON &#x683C;&#x5F0F;&#x6709;&#x4E24;&#x4E2A;&#x663E;&#x8457;&#x7684;&#x4F18;&#x70B9;&#xFF1A;&#x4E66;&#x5199;&#x7B80;&#x5355;&#xFF0C;&#x4E00;&#x76EE;&#x4E86;&#x7136;&#xFF1B;&#x7B26;&#x5408; JavaScript &#x539F;&#x751F;&#x8BED;&#x6CD5;&#xFF0C;&#x53EF;&#x4EE5;&#x7531;&#x89E3;&#x91CA;&#x5F15;&#x64CE;&#x76F4;&#x63A5;&#x5904;&#x7406;&#xFF0C;&#x4E0D;&#x7528;&#x53E6;&#x5916;&#x6DFB;&#x52A0;&#x89E3;&#x6790;&#x4EE3;&#x7801;&#x3002;&#x6240;&#x4EE5;&#xFF0C;JSON &#x8FC5;&#x901F;&#x88AB;&#x63A5;&#x53D7;&#xFF0C;&#x5DF2;&#x7ECF;&#x6210;&#x4E3A;&#x5404;&#x5927;&#x7F51;&#x7AD9;&#x4EA4;&#x6362;&#x6570;&#x636E;&#x7684;&#x6807;&#x51C6;&#x683C;&#x5F0F;&#xFF0C;&#x5E76;&#x88AB;&#x5199;&#x5165;&#x6807;&#x51C6;&#x3002;</p>
<p>&#x6BCF;&#x4E2A; JSON &#x5BF9;&#x8C61;&#x5C31;&#x662F;&#x4E00;&#x4E2A;&#x503C;&#xFF0C;&#x53EF;&#x80FD;&#x662F;&#x4E00;&#x4E2A;&#x6570;&#x7EC4;&#x6216;&#x5BF9;&#x8C61;&#xFF0C;&#x4E5F;&#x53EF;&#x80FD;&#x662F;&#x4E00;&#x4E2A;&#x539F;&#x59CB;&#x7C7B;&#x578B;&#x7684;&#x503C;&#x3002;&#x603B;&#x4E4B;&#xFF0C;&#x53EA;&#x80FD;&#x662F;&#x4E00;&#x4E2A;&#x503C;&#xFF0C;&#x4E0D;&#x80FD;&#x662F;&#x4E24;&#x4E2A;&#x6216;&#x66F4;&#x591A;&#x7684;&#x503C;&#x3002;</p>
<p>JSON &#x5BF9;&#x503C;&#x7684;&#x7C7B;&#x578B;&#x548C;&#x683C;&#x5F0F;&#x6709;&#x4E25;&#x683C;&#x7684;&#x89C4;&#x5B9A;&#x3002;</p>
<blockquote>
<ol>
<li><p>&#x590D;&#x5408;&#x7C7B;&#x578B;&#x7684;&#x503C;&#x53EA;&#x80FD;&#x662F;&#x6570;&#x7EC4;&#x6216;&#x5BF9;&#x8C61;&#xFF0C;&#x4E0D;&#x80FD;&#x662F;&#x51FD;&#x6570;&#x3001;&#x6B63;&#x5219;&#x8868;&#x8FBE;&#x5F0F;&#x5BF9;&#x8C61;&#x3001;&#x65E5;&#x671F;&#x5BF9;&#x8C61;&#x3002;</p>
</li>
<li><p>&#x539F;&#x59CB;&#x7C7B;&#x578B;&#x7684;&#x503C;&#x53EA;&#x6709;&#x56DB;&#x79CD;&#xFF1A;&#x5B57;&#x7B26;&#x4E32;&#x3001;&#x6570;&#x503C;&#xFF08;&#x5FC5;&#x987B;&#x4EE5;&#x5341;&#x8FDB;&#x5236;&#x8868;&#x793A;&#xFF09;&#x3001;&#x5E03;&#x5C14;&#x503C;&#x548C;<code>null</code>&#xFF08;&#x4E0D;&#x80FD;&#x4F7F;&#x7528;<code>NaN</code>, <code>Infinity</code>, <code>-Infinity</code>&#x548C;<code>undefined</code>&#xFF09;&#x3002;</p>
</li>
<li><p>&#x5B57;&#x7B26;&#x4E32;&#x5FC5;&#x987B;&#x4F7F;&#x7528;&#x53CC;&#x5F15;&#x53F7;&#x8868;&#x793A;&#xFF0C;&#x4E0D;&#x80FD;&#x4F7F;&#x7528;&#x5355;&#x5F15;&#x53F7;&#x3002;</p>
</li>
<li><p>&#x5BF9;&#x8C61;&#x7684;&#x952E;&#x540D;&#x5FC5;&#x987B;&#x653E;&#x5728;&#x53CC;&#x5F15;&#x53F7;&#x91CC;&#x9762;&#x3002;</p>
</li>
<li><p>&#x6570;&#x7EC4;&#x6216;&#x5BF9;&#x8C61;&#x6700;&#x540E;&#x4E00;&#x4E2A;&#x6210;&#x5458;&#x7684;&#x540E;&#x9762;&#xFF0C;&#x4E0D;&#x80FD;&#x52A0;&#x9017;&#x53F7;&#x3002;</p>
</li>
</ol>
</blockquote>
<p>&#x4EE5;&#x4E0B;&#x90FD;&#x662F;&#x5408;&#x6CD5;&#x7684; JSON&#x3002;</p>
<pre><code class="lang-javascript">[<span class="hljs-string">&quot;one&quot;</span>, <span class="hljs-string">&quot;two&quot;</span>, <span class="hljs-string">&quot;three&quot;</span>]

{ <span class="hljs-string">&quot;one&quot;</span>: <span class="hljs-number">1</span>, <span class="hljs-string">&quot;two&quot;</span>: <span class="hljs-number">2</span>, <span class="hljs-string">&quot;three&quot;</span>: <span class="hljs-number">3</span> }

{<span class="hljs-string">&quot;names&quot;</span>: [<span class="hljs-string">&quot;&#x5F20;&#x4E09;&quot;</span>, <span class="hljs-string">&quot;&#x674E;&#x56DB;&quot;</span>] }

[ { <span class="hljs-string">&quot;name&quot;</span>: <span class="hljs-string">&quot;&#x5F20;&#x4E09;&quot;</span>}, {<span class="hljs-string">&quot;name&quot;</span>: <span class="hljs-string">&quot;&#x674E;&#x56DB;&quot;</span>} ]
</code></pre>
<p>&#x4EE5;&#x4E0B;&#x90FD;&#x662F;&#x4E0D;&#x5408;&#x6CD5;&#x7684; JSON&#x3002;</p>
<pre><code class="lang-javascript">{ name: <span class="hljs-string">&quot;&#x5F20;&#x4E09;&quot;</span>, <span class="hljs-string">&apos;age&apos;</span>: <span class="hljs-number">32</span> }  <span class="hljs-comment">// &#x5C5E;&#x6027;&#x540D;&#x5FC5;&#x987B;&#x4F7F;&#x7528;&#x53CC;&#x5F15;&#x53F7;</span>

[<span class="hljs-number">32</span>, <span class="hljs-number">64</span>, <span class="hljs-number">128</span>, <span class="hljs-number">0xFFF</span>] <span class="hljs-comment">// &#x4E0D;&#x80FD;&#x4F7F;&#x7528;&#x5341;&#x516D;&#x8FDB;&#x5236;&#x503C;</span>

{ <span class="hljs-string">&quot;name&quot;</span>: <span class="hljs-string">&quot;&#x5F20;&#x4E09;&quot;</span>, <span class="hljs-string">&quot;age&quot;</span>: <span class="hljs-literal">undefined</span> } <span class="hljs-comment">// &#x4E0D;&#x80FD;&#x4F7F;&#x7528; undefined</span>

{ <span class="hljs-string">&quot;name&quot;</span>: <span class="hljs-string">&quot;&#x5F20;&#x4E09;&quot;</span>,
  <span class="hljs-string">&quot;birthday&quot;</span>: <span class="hljs-keyword">new</span> <span class="hljs-built_in">Date</span>(<span class="hljs-string">&apos;Fri, 26 Aug 2011 07:13:10 GMT&apos;</span>),
  <span class="hljs-string">&quot;getName&quot;</span>: <span class="hljs-function"><span class="hljs-keyword">function</span> (<span class="hljs-params"></span>) </span>{
      <span class="hljs-keyword">return</span> <span class="hljs-keyword">this</span>.name;
  }
} <span class="hljs-comment">// &#x5C5E;&#x6027;&#x503C;&#x4E0D;&#x80FD;&#x4F7F;&#x7528;&#x51FD;&#x6570;&#x548C;&#x65E5;&#x671F;&#x5BF9;&#x8C61;</span>
</code></pre>
<p>&#x6CE8;&#x610F;&#xFF0C;<code>null</code>&#x3001;&#x7A7A;&#x6570;&#x7EC4;&#x548C;&#x7A7A;&#x5BF9;&#x8C61;&#x90FD;&#x662F;&#x5408;&#x6CD5;&#x7684; JSON &#x503C;&#x3002;</p>
<h2 id="json-&#x5BF9;&#x8C61;">JSON &#x5BF9;&#x8C61;</h2>
<p><code>JSON</code>&#x5BF9;&#x8C61;&#x662F; JavaScript &#x7684;&#x539F;&#x751F;&#x5BF9;&#x8C61;&#xFF0C;&#x7528;&#x6765;&#x5904;&#x7406; JSON &#x683C;&#x5F0F;&#x6570;&#x636E;&#x3002;&#x5B83;&#x6709;&#x4E24;&#x4E2A;&#x9759;&#x6001;&#x65B9;&#x6CD5;&#xFF1A;<code>JSON.stringify()</code>&#x548C;<code>JSON.parse()</code>&#x3002;</p>
<h2 id="jsonstringify">JSON.stringify()</h2>
<h3 id="&#x57FA;&#x672C;&#x7528;&#x6CD5;">&#x57FA;&#x672C;&#x7528;&#x6CD5;</h3>
<p><code>JSON.stringify</code>&#x65B9;&#x6CD5;&#x7528;&#x4E8E;&#x5C06;&#x4E00;&#x4E2A;&#x503C;&#x8F6C;&#x4E3A; JSON &#x5B57;&#x7B26;&#x4E32;&#x3002;&#x8BE5;&#x5B57;&#x7B26;&#x4E32;&#x7B26;&#x5408; JSON &#x683C;&#x5F0F;&#xFF0C;&#x5E76;&#x4E14;&#x53EF;&#x4EE5;&#x88AB;<code>JSON.parse</code>&#x65B9;&#x6CD5;&#x8FD8;&#x539F;&#x3002;</p>
<pre><code class="lang-javascript"><span class="hljs-built_in">JSON</span>.stringify(<span class="hljs-string">&apos;abc&apos;</span>) <span class="hljs-comment">// &quot;&quot;abc&quot;&quot;</span>
<span class="hljs-built_in">JSON</span>.stringify(<span class="hljs-number">1</span>) <span class="hljs-comment">// &quot;1&quot;</span>
<span class="hljs-built_in">JSON</span>.stringify(<span class="hljs-literal">false</span>) <span class="hljs-comment">// &quot;false&quot;</span>
<span class="hljs-built_in">JSON</span>.stringify([]) <span class="hljs-comment">// &quot;[]&quot;</span>
<span class="hljs-built_in">JSON</span>.stringify({}) <span class="hljs-comment">// &quot;{}&quot;</span>

<span class="hljs-built_in">JSON</span>.stringify([<span class="hljs-number">1</span>, <span class="hljs-string">&quot;false&quot;</span>, <span class="hljs-literal">false</span>])
<span class="hljs-comment">// &apos;[1,&quot;false&quot;,false]&apos;</span>

<span class="hljs-built_in">JSON</span>.stringify({ name: <span class="hljs-string">&quot;&#x5F20;&#x4E09;&quot;</span> })
<span class="hljs-comment">// &apos;{&quot;name&quot;:&quot;&#x5F20;&#x4E09;&quot;}&apos;</span>
</code></pre>
<p>&#x4E0A;&#x9762;&#x4EE3;&#x7801;&#x5C06;&#x5404;&#x79CD;&#x7C7B;&#x578B;&#x7684;&#x503C;&#xFF0C;&#x8F6C;&#x6210; JSON &#x5B57;&#x7B26;&#x4E32;&#x3002;</p>
<p>&#x6CE8;&#x610F;&#xFF0C;&#x5BF9;&#x4E8E;&#x539F;&#x59CB;&#x7C7B;&#x578B;&#x7684;&#x5B57;&#x7B26;&#x4E32;&#xFF0C;&#x8F6C;&#x6362;&#x7ED3;&#x679C;&#x4F1A;&#x5E26;&#x53CC;&#x5F15;&#x53F7;&#x3002;</p>
<pre><code class="lang-javascript"><span class="hljs-built_in">JSON</span>.stringify(<span class="hljs-string">&apos;foo&apos;</span>) === <span class="hljs-string">&quot;foo&quot;</span> <span class="hljs-comment">// false</span>
<span class="hljs-built_in">JSON</span>.stringify(<span class="hljs-string">&apos;foo&apos;</span>) === <span class="hljs-string">&quot;\&quot;foo\&quot;&quot;</span> <span class="hljs-comment">// true</span>
</code></pre>
<p>&#x4E0A;&#x9762;&#x4EE3;&#x7801;&#x4E2D;&#xFF0C;&#x5B57;&#x7B26;&#x4E32;<code>foo</code>&#xFF0C;&#x88AB;&#x8F6C;&#x6210;&#x4E86;<code>&quot;\&quot;foo\&quot;&quot;</code>&#x3002;&#x8FD9;&#x662F;&#x56E0;&#x4E3A;&#x5C06;&#x6765;&#x8FD8;&#x539F;&#x7684;&#x65F6;&#x5019;&#xFF0C;&#x5185;&#x5C42;&#x53CC;&#x5F15;&#x53F7;&#x53EF;&#x4EE5;&#x8BA9; JavaScript &#x5F15;&#x64CE;&#x77E5;&#x9053;&#xFF0C;&#x8FD9;&#x662F;&#x4E00;&#x4E2A;&#x5B57;&#x7B26;&#x4E32;&#xFF0C;&#x800C;&#x4E0D;&#x662F;&#x5176;&#x4ED6;&#x7C7B;&#x578B;&#x7684;&#x503C;&#x3002;</p>
<pre><code class="lang-javascript"><span class="hljs-built_in">JSON</span>.stringify(<span class="hljs-literal">false</span>) <span class="hljs-comment">// &quot;false&quot;</span>
<span class="hljs-built_in">JSON</span>.stringify(<span class="hljs-string">&apos;false&apos;</span>) <span class="hljs-comment">// &quot;\&quot;false\&quot;&quot;</span>
</code></pre>
<p>&#x4E0A;&#x9762;&#x4EE3;&#x7801;&#x4E2D;&#xFF0C;&#x5982;&#x679C;&#x4E0D;&#x662F;&#x5185;&#x5C42;&#x7684;&#x53CC;&#x5F15;&#x53F7;&#xFF0C;&#x5C06;&#x6765;&#x8FD8;&#x539F;&#x7684;&#x65F6;&#x5019;&#xFF0C;&#x5F15;&#x64CE;&#x5C31;&#x65E0;&#x6CD5;&#x77E5;&#x9053;&#x539F;&#x59CB;&#x503C;&#x662F;&#x5E03;&#x5C14;&#x503C;&#x8FD8;&#x662F;&#x5B57;&#x7B26;&#x4E32;&#x3002;</p>
<p>&#x5982;&#x679C;&#x5BF9;&#x8C61;&#x7684;&#x5C5E;&#x6027;&#x662F;<code>undefined</code>&#x3001;&#x51FD;&#x6570;&#x6216; XML &#x5BF9;&#x8C61;&#xFF0C;&#x8BE5;&#x5C5E;&#x6027;&#x4F1A;&#x88AB;<code>JSON.stringify</code>&#x8FC7;&#x6EE4;&#x3002;</p>
<pre><code class="lang-javascript"><span class="hljs-keyword">var</span> obj = {
  a: <span class="hljs-literal">undefined</span>,
  b: <span class="hljs-function"><span class="hljs-keyword">function</span> (<span class="hljs-params"></span>) </span>{}
};

<span class="hljs-built_in">JSON</span>.stringify(obj) <span class="hljs-comment">// &quot;{}&quot;</span>
</code></pre>
<p>&#x4E0A;&#x9762;&#x4EE3;&#x7801;&#x4E2D;&#xFF0C;&#x5BF9;&#x8C61;<code>obj</code>&#x7684;<code>a</code>&#x5C5E;&#x6027;&#x662F;<code>undefined</code>&#xFF0C;&#x800C;<code>b</code>&#x5C5E;&#x6027;&#x662F;&#x4E00;&#x4E2A;&#x51FD;&#x6570;&#xFF0C;&#x7ED3;&#x679C;&#x90FD;&#x88AB;<code>JSON.stringify</code>&#x8FC7;&#x6EE4;&#x3002;</p>
<p>&#x5982;&#x679C;&#x6570;&#x7EC4;&#x7684;&#x6210;&#x5458;&#x662F;<code>undefined</code>&#x3001;&#x51FD;&#x6570;&#x6216; XML &#x5BF9;&#x8C61;&#xFF0C;&#x5219;&#x8FD9;&#x4E9B;&#x503C;&#x88AB;&#x8F6C;&#x6210;<code>null</code>&#x3002;</p>
<pre><code class="lang-javascript"><span class="hljs-keyword">var</span> arr = [<span class="hljs-literal">undefined</span>, <span class="hljs-function"><span class="hljs-keyword">function</span> (<span class="hljs-params"></span>) </span>{}];
<span class="hljs-built_in">JSON</span>.stringify(arr) <span class="hljs-comment">// &quot;[null,null]&quot;</span>
</code></pre>
<p>&#x4E0A;&#x9762;&#x4EE3;&#x7801;&#x4E2D;&#xFF0C;&#x6570;&#x7EC4;<code>arr</code>&#x7684;&#x6210;&#x5458;&#x662F;<code>undefined</code>&#x548C;&#x51FD;&#x6570;&#xFF0C;&#x5B83;&#x4EEC;&#x90FD;&#x88AB;&#x8F6C;&#x6210;&#x4E86;<code>null</code>&#x3002;</p>
<p>&#x6B63;&#x5219;&#x5BF9;&#x8C61;&#x4F1A;&#x88AB;&#x8F6C;&#x6210;&#x7A7A;&#x5BF9;&#x8C61;&#x3002;</p>
<pre><code class="lang-javascript"><span class="hljs-built_in">JSON</span>.stringify(<span class="hljs-regexp">/foo/</span>) <span class="hljs-comment">// &quot;{}&quot;</span>
</code></pre>
<p><code>JSON.stringify</code>&#x65B9;&#x6CD5;&#x4F1A;&#x5FFD;&#x7565;&#x5BF9;&#x8C61;&#x7684;&#x4E0D;&#x53EF;&#x904D;&#x5386;&#x7684;&#x5C5E;&#x6027;&#x3002;</p>
<pre><code class="lang-javascript"><span class="hljs-keyword">var</span> obj = {};
<span class="hljs-built_in">Object</span>.defineProperties(obj, {
  <span class="hljs-string">&apos;foo&apos;</span>: {
    value: <span class="hljs-number">1</span>,
    enumerable: <span class="hljs-literal">true</span>
  },
  <span class="hljs-string">&apos;bar&apos;</span>: {
    value: <span class="hljs-number">2</span>,
    enumerable: <span class="hljs-literal">false</span>
  }
});

<span class="hljs-built_in">JSON</span>.stringify(obj); <span class="hljs-comment">// &quot;{&quot;foo&quot;:1}&quot;</span>
</code></pre>
<p>&#x4E0A;&#x9762;&#x4EE3;&#x7801;&#x4E2D;&#xFF0C;<code>bar</code>&#x662F;<code>obj</code>&#x5BF9;&#x8C61;&#x7684;&#x4E0D;&#x53EF;&#x904D;&#x5386;&#x5C5E;&#x6027;&#xFF0C;<code>JSON.stringify</code>&#x65B9;&#x6CD5;&#x4F1A;&#x5FFD;&#x7565;&#x8FD9;&#x4E2A;&#x5C5E;&#x6027;&#x3002;</p>
<h3 id="&#x7B2C;&#x4E8C;&#x4E2A;&#x53C2;&#x6570;">&#x7B2C;&#x4E8C;&#x4E2A;&#x53C2;&#x6570;</h3>
<p><code>JSON.stringify</code>&#x65B9;&#x6CD5;&#x8FD8;&#x53EF;&#x4EE5;&#x63A5;&#x53D7;&#x4E00;&#x4E2A;&#x6570;&#x7EC4;&#xFF0C;&#x4F5C;&#x4E3A;&#x7B2C;&#x4E8C;&#x4E2A;&#x53C2;&#x6570;&#xFF0C;&#x6307;&#x5B9A;&#x9700;&#x8981;&#x8F6C;&#x6210;&#x5B57;&#x7B26;&#x4E32;&#x7684;&#x5C5E;&#x6027;&#x3002;</p>
<pre><code class="lang-javascript"><span class="hljs-keyword">var</span> obj = {
  <span class="hljs-string">&apos;prop1&apos;</span>: <span class="hljs-string">&apos;value1&apos;</span>,
  <span class="hljs-string">&apos;prop2&apos;</span>: <span class="hljs-string">&apos;value2&apos;</span>,
  <span class="hljs-string">&apos;prop3&apos;</span>: <span class="hljs-string">&apos;value3&apos;</span>
};

<span class="hljs-keyword">var</span> selectedProperties = [<span class="hljs-string">&apos;prop1&apos;</span>, <span class="hljs-string">&apos;prop2&apos;</span>];

<span class="hljs-built_in">JSON</span>.stringify(obj, selectedProperties)
<span class="hljs-comment">// &quot;{&quot;prop1&quot;:&quot;value1&quot;,&quot;prop2&quot;:&quot;value2&quot;}&quot;</span>
</code></pre>
<p>&#x4E0A;&#x9762;&#x4EE3;&#x7801;&#x4E2D;&#xFF0C;<code>JSON.stringify</code>&#x65B9;&#x6CD5;&#x7684;&#x7B2C;&#x4E8C;&#x4E2A;&#x53C2;&#x6570;&#x6307;&#x5B9A;&#xFF0C;&#x53EA;&#x8F6C;<code>prop1</code>&#x548C;<code>prop2</code>&#x4E24;&#x4E2A;&#x5C5E;&#x6027;&#x3002;</p>
<p>&#x8FD9;&#x4E2A;&#x7C7B;&#x4F3C;&#x767D;&#x540D;&#x5355;&#x7684;&#x6570;&#x7EC4;&#xFF0C;&#x53EA;&#x5BF9;&#x5BF9;&#x8C61;&#x7684;&#x5C5E;&#x6027;&#x6709;&#x6548;&#xFF0C;&#x5BF9;&#x6570;&#x7EC4;&#x65E0;&#x6548;&#x3002;</p>
<pre><code class="lang-javascript"><span class="hljs-built_in">JSON</span>.stringify([<span class="hljs-string">&apos;a&apos;</span>, <span class="hljs-string">&apos;b&apos;</span>], [<span class="hljs-string">&apos;0&apos;</span>])
<span class="hljs-comment">// &quot;[&quot;a&quot;,&quot;b&quot;]&quot;</span>

<span class="hljs-built_in">JSON</span>.stringify({<span class="hljs-number">0</span>: <span class="hljs-string">&apos;a&apos;</span>, <span class="hljs-number">1</span>: <span class="hljs-string">&apos;b&apos;</span>}, [<span class="hljs-string">&apos;0&apos;</span>])
<span class="hljs-comment">// &quot;{&quot;0&quot;:&quot;a&quot;}&quot;</span>
</code></pre>
<p>&#x4E0A;&#x9762;&#x4EE3;&#x7801;&#x4E2D;&#xFF0C;&#x7B2C;&#x4E8C;&#x4E2A;&#x53C2;&#x6570;&#x6307;&#x5B9A; JSON &#x683C;&#x5F0F;&#x53EA;&#x8F6C;<code>0</code>&#x53F7;&#x5C5E;&#x6027;&#xFF0C;&#x5B9E;&#x9645;&#x4E0A;&#x5BF9;&#x6570;&#x7EC4;&#x662F;&#x65E0;&#x6548;&#x7684;&#xFF0C;&#x53EA;&#x5BF9;&#x5BF9;&#x8C61;&#x6709;&#x6548;&#x3002;</p>
<p>&#x7B2C;&#x4E8C;&#x4E2A;&#x53C2;&#x6570;&#x8FD8;&#x53EF;&#x4EE5;&#x662F;&#x4E00;&#x4E2A;&#x51FD;&#x6570;&#xFF0C;&#x7528;&#x6765;&#x66F4;&#x6539;<code>JSON.stringify</code>&#x7684;&#x8FD4;&#x56DE;&#x503C;&#x3002;</p>
<pre><code class="lang-javascript"><span class="hljs-function"><span class="hljs-keyword">function</span> <span class="hljs-title">f</span>(<span class="hljs-params">key, value</span>) </span>{
  <span class="hljs-keyword">if</span> (<span class="hljs-keyword">typeof</span> value === <span class="hljs-string">&quot;number&quot;</span>) {
    value = <span class="hljs-number">2</span> * value;
  }
  <span class="hljs-keyword">return</span> value;
}

<span class="hljs-built_in">JSON</span>.stringify({ a: <span class="hljs-number">1</span>, b: <span class="hljs-number">2</span> }, f)
<span class="hljs-comment">// &apos;{&quot;a&quot;: 2,&quot;b&quot;: 4}&apos;</span>
</code></pre>
<p>&#x4E0A;&#x9762;&#x4EE3;&#x7801;&#x4E2D;&#x7684;<code>f</code>&#x51FD;&#x6570;&#xFF0C;&#x63A5;&#x53D7;&#x4E24;&#x4E2A;&#x53C2;&#x6570;&#xFF0C;&#x5206;&#x522B;&#x662F;&#x88AB;&#x8F6C;&#x6362;&#x7684;&#x5BF9;&#x8C61;&#x7684;&#x952E;&#x540D;&#x548C;&#x952E;&#x503C;&#x3002;&#x5982;&#x679C;&#x952E;&#x503C;&#x662F;&#x6570;&#x503C;&#xFF0C;&#x5C31;&#x5C06;&#x5B83;&#x4E58;&#x4EE5;<code>2</code>&#xFF0C;&#x5426;&#x5219;&#x5C31;&#x539F;&#x6837;&#x8FD4;&#x56DE;&#x3002;</p>
<p>&#x6CE8;&#x610F;&#xFF0C;&#x8FD9;&#x4E2A;&#x5904;&#x7406;&#x51FD;&#x6570;&#x662F;&#x9012;&#x5F52;&#x5904;&#x7406;&#x6240;&#x6709;&#x7684;&#x952E;&#x3002;</p>
<pre><code class="lang-javascript"><span class="hljs-keyword">var</span> o = {a: {b: <span class="hljs-number">1</span>}};

<span class="hljs-function"><span class="hljs-keyword">function</span> <span class="hljs-title">f</span>(<span class="hljs-params">key, value</span>) </span>{
  <span class="hljs-built_in">console</span>.log(<span class="hljs-string">&quot;[&quot;</span>+ key +<span class="hljs-string">&quot;]:&quot;</span> + value);
  <span class="hljs-keyword">return</span> value;
}

<span class="hljs-built_in">JSON</span>.stringify(o, f)
<span class="hljs-comment">// []:[object Object]</span>
<span class="hljs-comment">// [a]:[object Object]</span>
<span class="hljs-comment">// [b]:1</span>
<span class="hljs-comment">// &apos;{&quot;a&quot;:{&quot;b&quot;:1}}&apos;</span>
</code></pre>
<p>&#x4E0A;&#x9762;&#x4EE3;&#x7801;&#x4E2D;&#xFF0C;&#x5BF9;&#x8C61;<code>o</code>&#x4E00;&#x5171;&#x4F1A;&#x88AB;<code>f</code>&#x51FD;&#x6570;&#x5904;&#x7406;&#x4E09;&#x6B21;&#xFF0C;&#x6700;&#x540E;&#x90A3;&#x884C;&#x662F;<code>JSON.stringify</code>&#x7684;&#x8F93;&#x51FA;&#x3002;&#x7B2C;&#x4E00;&#x6B21;&#x952E;&#x540D;&#x4E3A;&#x7A7A;&#xFF0C;&#x952E;&#x503C;&#x662F;&#x6574;&#x4E2A;&#x5BF9;&#x8C61;<code>o</code>&#xFF1B;&#x7B2C;&#x4E8C;&#x6B21;&#x952E;&#x540D;&#x4E3A;<code>a</code>&#xFF0C;&#x952E;&#x503C;&#x662F;<code>{b: 1}</code>&#xFF1B;&#x7B2C;&#x4E09;&#x6B21;&#x952E;&#x540D;&#x4E3A;<code>b</code>&#xFF0C;&#x952E;&#x503C;&#x4E3A;1&#x3002;</p>
<p>&#x9012;&#x5F52;&#x5904;&#x7406;&#x4E2D;&#xFF0C;&#x6BCF;&#x4E00;&#x6B21;&#x5904;&#x7406;&#x7684;&#x5BF9;&#x8C61;&#xFF0C;&#x90FD;&#x662F;&#x524D;&#x4E00;&#x6B21;&#x8FD4;&#x56DE;&#x7684;&#x503C;&#x3002;</p>
<pre><code class="lang-javascript"><span class="hljs-keyword">var</span> o = {a: <span class="hljs-number">1</span>};

<span class="hljs-function"><span class="hljs-keyword">function</span> <span class="hljs-title">f</span>(<span class="hljs-params">key, value</span>) </span>{
  <span class="hljs-keyword">if</span> (<span class="hljs-keyword">typeof</span> value === <span class="hljs-string">&apos;object&apos;</span>) {
    <span class="hljs-keyword">return</span> {b: <span class="hljs-number">2</span>};
  }
  <span class="hljs-keyword">return</span> value * <span class="hljs-number">2</span>;
}

<span class="hljs-built_in">JSON</span>.stringify(o, f)
<span class="hljs-comment">// &quot;{&quot;b&quot;: 4}&quot;</span>
</code></pre>
<p>&#x4E0A;&#x9762;&#x4EE3;&#x7801;&#x4E2D;&#xFF0C;<code>f</code>&#x51FD;&#x6570;&#x4FEE;&#x6539;&#x4E86;&#x5BF9;&#x8C61;<code>o</code>&#xFF0C;&#x63A5;&#x7740;<code>JSON.stringify</code>&#x65B9;&#x6CD5;&#x5C31;&#x9012;&#x5F52;&#x5904;&#x7406;&#x4FEE;&#x6539;&#x540E;&#x7684;&#x5BF9;&#x8C61;<code>o</code>&#x3002;</p>
<p>&#x5982;&#x679C;&#x5904;&#x7406;&#x51FD;&#x6570;&#x8FD4;&#x56DE;<code>undefined</code>&#x6216;&#x6CA1;&#x6709;&#x8FD4;&#x56DE;&#x503C;&#xFF0C;&#x5219;&#x8BE5;&#x5C5E;&#x6027;&#x4F1A;&#x88AB;&#x5FFD;&#x7565;&#x3002;</p>
<pre><code class="lang-javascript"><span class="hljs-function"><span class="hljs-keyword">function</span> <span class="hljs-title">f</span>(<span class="hljs-params">key, value</span>) </span>{
  <span class="hljs-keyword">if</span> (<span class="hljs-keyword">typeof</span>(value) === <span class="hljs-string">&quot;string&quot;</span>) {
    <span class="hljs-keyword">return</span> <span class="hljs-literal">undefined</span>;
  }
  <span class="hljs-keyword">return</span> value;
}

<span class="hljs-built_in">JSON</span>.stringify({ a: <span class="hljs-string">&quot;abc&quot;</span>, b: <span class="hljs-number">123</span> }, f)
<span class="hljs-comment">// &apos;{&quot;b&quot;: 123}&apos;</span>
</code></pre>
<p>&#x4E0A;&#x9762;&#x4EE3;&#x7801;&#x4E2D;&#xFF0C;<code>a</code>&#x5C5E;&#x6027;&#x7ECF;&#x8FC7;&#x5904;&#x7406;&#x540E;&#xFF0C;&#x8FD4;&#x56DE;<code>undefined</code>&#xFF0C;&#x4E8E;&#x662F;&#x8BE5;&#x5C5E;&#x6027;&#x88AB;&#x5FFD;&#x7565;&#x4E86;&#x3002;</p>
<h3 id="&#x7B2C;&#x4E09;&#x4E2A;&#x53C2;&#x6570;">&#x7B2C;&#x4E09;&#x4E2A;&#x53C2;&#x6570;</h3>
<p><code>JSON.stringify</code>&#x8FD8;&#x53EF;&#x4EE5;&#x63A5;&#x53D7;&#x7B2C;&#x4E09;&#x4E2A;&#x53C2;&#x6570;&#xFF0C;&#x7528;&#x4E8E;&#x589E;&#x52A0;&#x8FD4;&#x56DE;&#x7684; JSON &#x5B57;&#x7B26;&#x4E32;&#x7684;&#x53EF;&#x8BFB;&#x6027;&#x3002;&#x5982;&#x679C;&#x662F;&#x6570;&#x5B57;&#xFF0C;&#x8868;&#x793A;&#x6BCF;&#x4E2A;&#x5C5E;&#x6027;&#x524D;&#x9762;&#x6DFB;&#x52A0;&#x7684;&#x7A7A;&#x683C;&#xFF08;&#x6700;&#x591A;&#x4E0D;&#x8D85;&#x8FC7;10&#x4E2A;&#xFF09;&#xFF1B;&#x5982;&#x679C;&#x662F;&#x5B57;&#x7B26;&#x4E32;&#xFF08;&#x4E0D;&#x8D85;&#x8FC7;10&#x4E2A;&#x5B57;&#x7B26;&#xFF09;&#xFF0C;&#x5219;&#x8BE5;&#x5B57;&#x7B26;&#x4E32;&#x4F1A;&#x6DFB;&#x52A0;&#x5728;&#x6BCF;&#x884C;&#x524D;&#x9762;&#x3002;</p>
<pre><code class="lang-javascript"><span class="hljs-built_in">JSON</span>.stringify({ p1: <span class="hljs-number">1</span>, p2: <span class="hljs-number">2</span> }, <span class="hljs-literal">null</span>, <span class="hljs-number">2</span>);
<span class="hljs-comment">/*
&quot;{
  &quot;p1&quot;: 1,
  &quot;p2&quot;: 2
}&quot;
*/</span>

<span class="hljs-built_in">JSON</span>.stringify({ p1:<span class="hljs-number">1</span>, p2:<span class="hljs-number">2</span> }, <span class="hljs-literal">null</span>, <span class="hljs-string">&apos;|-&apos;</span>);
<span class="hljs-comment">/*
&quot;{
|-&quot;p1&quot;: 1,
|-&quot;p2&quot;: 2
}&quot;
*/</span>
</code></pre>
<h3 id="&#x53C2;&#x6570;&#x5BF9;&#x8C61;&#x7684;-tojson-&#x65B9;&#x6CD5;">&#x53C2;&#x6570;&#x5BF9;&#x8C61;&#x7684; toJSON &#x65B9;&#x6CD5;</h3>
<p>&#x5982;&#x679C;&#x53C2;&#x6570;&#x5BF9;&#x8C61;&#x6709;&#x81EA;&#x5B9A;&#x4E49;&#x7684;<code>toJSON</code>&#x65B9;&#x6CD5;&#xFF0C;&#x90A3;&#x4E48;<code>JSON.stringify</code>&#x4F1A;&#x4F7F;&#x7528;&#x8FD9;&#x4E2A;&#x65B9;&#x6CD5;&#x7684;&#x8FD4;&#x56DE;&#x503C;&#x4F5C;&#x4E3A;&#x53C2;&#x6570;&#xFF0C;&#x800C;&#x5FFD;&#x7565;&#x539F;&#x5BF9;&#x8C61;&#x7684;&#x5176;&#x4ED6;&#x5C5E;&#x6027;&#x3002;</p>
<p>&#x4E0B;&#x9762;&#x662F;&#x4E00;&#x4E2A;&#x666E;&#x901A;&#x7684;&#x5BF9;&#x8C61;&#x3002;</p>
<pre><code class="lang-javascript"><span class="hljs-keyword">var</span> user = {
  firstName: <span class="hljs-string">&apos;&#x4E09;&apos;</span>,
  lastName: <span class="hljs-string">&apos;&#x5F20;&apos;</span>,

  get fullName(){
    <span class="hljs-keyword">return</span> <span class="hljs-keyword">this</span>.lastName + <span class="hljs-keyword">this</span>.firstName;
  }
};

<span class="hljs-built_in">JSON</span>.stringify(user)
<span class="hljs-comment">// &quot;{&quot;firstName&quot;:&quot;&#x4E09;&quot;,&quot;lastName&quot;:&quot;&#x5F20;&quot;,&quot;fullName&quot;:&quot;&#x5F20;&#x4E09;&quot;}&quot;</span>
</code></pre>
<p>&#x73B0;&#x5728;&#xFF0C;&#x4E3A;&#x8FD9;&#x4E2A;&#x5BF9;&#x8C61;&#x52A0;&#x4E0A;<code>toJSON</code>&#x65B9;&#x6CD5;&#x3002;</p>
<pre><code class="lang-javascript"><span class="hljs-keyword">var</span> user = {
  firstName: <span class="hljs-string">&apos;&#x4E09;&apos;</span>,
  lastName: <span class="hljs-string">&apos;&#x5F20;&apos;</span>,

  get fullName(){
    <span class="hljs-keyword">return</span> <span class="hljs-keyword">this</span>.lastName + <span class="hljs-keyword">this</span>.firstName;
  },

  toJSON: <span class="hljs-function"><span class="hljs-keyword">function</span> (<span class="hljs-params"></span>) </span>{
    <span class="hljs-keyword">return</span> {
      name: <span class="hljs-keyword">this</span>.lastName + <span class="hljs-keyword">this</span>.firstName
    };
  }
};

<span class="hljs-built_in">JSON</span>.stringify(user)
<span class="hljs-comment">// &quot;{&quot;name&quot;:&quot;&#x5F20;&#x4E09;&quot;}&quot;</span>
</code></pre>
<p>&#x4E0A;&#x9762;&#x4EE3;&#x7801;&#x4E2D;&#xFF0C;<code>JSON.stringify</code>&#x53D1;&#x73B0;&#x53C2;&#x6570;&#x5BF9;&#x8C61;&#x6709;<code>toJSON</code>&#x65B9;&#x6CD5;&#xFF0C;&#x5C31;&#x76F4;&#x63A5;&#x4F7F;&#x7528;&#x8FD9;&#x4E2A;&#x65B9;&#x6CD5;&#x7684;&#x8FD4;&#x56DE;&#x503C;&#x4F5C;&#x4E3A;&#x53C2;&#x6570;&#xFF0C;&#x800C;&#x5FFD;&#x7565;&#x539F;&#x5BF9;&#x8C61;&#x7684;&#x5176;&#x4ED6;&#x53C2;&#x6570;&#x3002;</p>
<p><code>Date</code>&#x5BF9;&#x8C61;&#x5C31;&#x6709;&#x4E00;&#x4E2A;&#x81EA;&#x5DF1;&#x7684;<code>toJSON</code>&#x65B9;&#x6CD5;&#x3002;</p>
<pre><code class="lang-javascript"><span class="hljs-keyword">var</span> date = <span class="hljs-keyword">new</span> <span class="hljs-built_in">Date</span>(<span class="hljs-string">&apos;2015-01-01&apos;</span>);
date.toJSON() <span class="hljs-comment">// &quot;2015-01-01T00:00:00.000Z&quot;</span>
<span class="hljs-built_in">JSON</span>.stringify(date) <span class="hljs-comment">// &quot;&quot;2015-01-01T00:00:00.000Z&quot;&quot;</span>
</code></pre>
<p>&#x4E0A;&#x9762;&#x4EE3;&#x7801;&#x4E2D;&#xFF0C;<code>JSON.stringify</code>&#x53D1;&#x73B0;&#x5904;&#x7406;&#x7684;&#x662F;<code>Date</code>&#x5BF9;&#x8C61;&#x5B9E;&#x4F8B;&#xFF0C;&#x5C31;&#x4F1A;&#x8C03;&#x7528;&#x8FD9;&#x4E2A;&#x5B9E;&#x4F8B;&#x5BF9;&#x8C61;&#x7684;<code>toJSON</code>&#x65B9;&#x6CD5;&#xFF0C;&#x5C06;&#x8BE5;&#x65B9;&#x6CD5;&#x7684;&#x8FD4;&#x56DE;&#x503C;&#x4F5C;&#x4E3A;&#x53C2;&#x6570;&#x3002;</p>
<p><code>toJSON</code>&#x65B9;&#x6CD5;&#x7684;&#x4E00;&#x4E2A;&#x5E94;&#x7528;&#x662F;&#xFF0C;&#x5C06;&#x6B63;&#x5219;&#x5BF9;&#x8C61;&#x81EA;&#x52A8;&#x8F6C;&#x4E3A;&#x5B57;&#x7B26;&#x4E32;&#x3002;&#x56E0;&#x4E3A;<code>JSON.stringify</code>&#x9ED8;&#x8BA4;&#x4E0D;&#x80FD;&#x8F6C;&#x6362;&#x6B63;&#x5219;&#x5BF9;&#x8C61;&#xFF0C;&#x4F46;&#x662F;&#x8BBE;&#x7F6E;&#x4E86;<code>toJSON</code>&#x65B9;&#x6CD5;&#x4EE5;&#x540E;&#xFF0C;&#x5C31;&#x53EF;&#x4EE5;&#x8F6C;&#x6362;&#x6B63;&#x5219;&#x5BF9;&#x8C61;&#x4E86;&#x3002;</p>
<pre><code class="lang-javascript"><span class="hljs-keyword">var</span> obj = {
  reg: <span class="hljs-regexp">/foo/</span>
};

<span class="hljs-comment">// &#x4E0D;&#x8BBE;&#x7F6E; toJSON &#x65B9;&#x6CD5;&#x65F6;</span>
<span class="hljs-built_in">JSON</span>.stringify(obj) <span class="hljs-comment">// &quot;{&quot;reg&quot;:{}}&quot;</span>

<span class="hljs-comment">// &#x8BBE;&#x7F6E; toJSON &#x65B9;&#x6CD5;&#x65F6;</span>
<span class="hljs-built_in">RegExp</span>.prototype.toJSON = <span class="hljs-built_in">RegExp</span>.prototype.toString;
<span class="hljs-built_in">JSON</span>.stringify(<span class="hljs-regexp">/foo/</span>) <span class="hljs-comment">// &quot;&quot;/foo/&quot;&quot;</span>
</code></pre>
<p>&#x4E0A;&#x9762;&#x4EE3;&#x7801;&#x5728;&#x6B63;&#x5219;&#x5BF9;&#x8C61;&#x7684;&#x539F;&#x578B;&#x4E0A;&#x9762;&#x90E8;&#x7F72;&#x4E86;<code>toJSON()</code>&#x65B9;&#x6CD5;&#xFF0C;&#x5C06;&#x5176;&#x6307;&#x5411;<code>toString()</code>&#x65B9;&#x6CD5;&#xFF0C;&#x56E0;&#x6B64;&#x8F6C;&#x6362;&#x6210; JSON &#x683C;&#x5F0F;&#x65F6;&#xFF0C;&#x6B63;&#x5219;&#x5BF9;&#x8C61;&#x5C31;&#x5148;&#x8C03;&#x7528;<code>toJSON()</code>&#x65B9;&#x6CD5;&#x8F6C;&#x4E3A;&#x5B57;&#x7B26;&#x4E32;&#xFF0C;&#x7136;&#x540E;&#x518D;&#x88AB;<code>JSON.stringify()</code>&#x65B9;&#x6CD5;&#x5904;&#x7406;&#x3002;</p>
<h2 id="jsonparse">JSON.parse()</h2>
<p><code>JSON.parse</code>&#x65B9;&#x6CD5;&#x7528;&#x4E8E;&#x5C06; JSON &#x5B57;&#x7B26;&#x4E32;&#x8F6C;&#x6362;&#x6210;&#x5BF9;&#x5E94;&#x7684;&#x503C;&#x3002;</p>
<pre><code class="lang-javascript"><span class="hljs-built_in">JSON</span>.parse(<span class="hljs-string">&apos;{}&apos;</span>) <span class="hljs-comment">// {}</span>
<span class="hljs-built_in">JSON</span>.parse(<span class="hljs-string">&apos;true&apos;</span>) <span class="hljs-comment">// true</span>
<span class="hljs-built_in">JSON</span>.parse(<span class="hljs-string">&apos;&quot;foo&quot;&apos;</span>) <span class="hljs-comment">// &quot;foo&quot;</span>
<span class="hljs-built_in">JSON</span>.parse(<span class="hljs-string">&apos;[1, 5, &quot;false&quot;]&apos;</span>) <span class="hljs-comment">// [1, 5, &quot;false&quot;]</span>
<span class="hljs-built_in">JSON</span>.parse(<span class="hljs-string">&apos;null&apos;</span>) <span class="hljs-comment">// null</span>

<span class="hljs-keyword">var</span> o = <span class="hljs-built_in">JSON</span>.parse(<span class="hljs-string">&apos;{&quot;name&quot;: &quot;&#x5F20;&#x4E09;&quot;}&apos;</span>);
o.name <span class="hljs-comment">// &#x5F20;&#x4E09;</span>
</code></pre>
<p>&#x5982;&#x679C;&#x4F20;&#x5165;&#x7684;&#x5B57;&#x7B26;&#x4E32;&#x4E0D;&#x662F;&#x6709;&#x6548;&#x7684; JSON &#x683C;&#x5F0F;&#xFF0C;<code>JSON.parse</code>&#x65B9;&#x6CD5;&#x5C06;&#x62A5;&#x9519;&#x3002;</p>
<pre><code class="lang-javascript"><span class="hljs-built_in">JSON</span>.parse(<span class="hljs-string">&quot;&apos;String&apos;&quot;</span>) <span class="hljs-comment">// illegal single quotes</span>
<span class="hljs-comment">// SyntaxError: Unexpected token ILLEGAL</span>
</code></pre>
<p>&#x4E0A;&#x9762;&#x4EE3;&#x7801;&#x4E2D;&#xFF0C;&#x53CC;&#x5F15;&#x53F7;&#x5B57;&#x7B26;&#x4E32;&#x4E2D;&#x662F;&#x4E00;&#x4E2A;&#x5355;&#x5F15;&#x53F7;&#x5B57;&#x7B26;&#x4E32;&#xFF0C;&#x56E0;&#x4E3A;&#x5355;&#x5F15;&#x53F7;&#x5B57;&#x7B26;&#x4E32;&#x4E0D;&#x7B26;&#x5408; JSON &#x683C;&#x5F0F;&#xFF0C;&#x6240;&#x4EE5;&#x62A5;&#x9519;&#x3002;</p>
<p>&#x4E3A;&#x4E86;&#x5904;&#x7406;&#x89E3;&#x6790;&#x9519;&#x8BEF;&#xFF0C;&#x53EF;&#x4EE5;&#x5C06;<code>JSON.parse</code>&#x65B9;&#x6CD5;&#x653E;&#x5728;<code>try...catch</code>&#x4EE3;&#x7801;&#x5757;&#x4E2D;&#x3002;</p>
<pre><code class="lang-javascript"><span class="hljs-keyword">try</span> {
  <span class="hljs-built_in">JSON</span>.parse(<span class="hljs-string">&quot;&apos;String&apos;&quot;</span>);
} <span class="hljs-keyword">catch</span>(e) {
  <span class="hljs-built_in">console</span>.log(<span class="hljs-string">&apos;parsing error&apos;</span>);
}
</code></pre>
<p><code>JSON.parse</code>&#x65B9;&#x6CD5;&#x53EF;&#x4EE5;&#x63A5;&#x53D7;&#x4E00;&#x4E2A;&#x5904;&#x7406;&#x51FD;&#x6570;&#xFF0C;&#x4F5C;&#x4E3A;&#x7B2C;&#x4E8C;&#x4E2A;&#x53C2;&#x6570;&#xFF0C;&#x7528;&#x6CD5;&#x4E0E;<code>JSON.stringify</code>&#x65B9;&#x6CD5;&#x7C7B;&#x4F3C;&#x3002;</p>
<pre><code class="lang-javascript"><span class="hljs-function"><span class="hljs-keyword">function</span> <span class="hljs-title">f</span>(<span class="hljs-params">key, value</span>) </span>{
  <span class="hljs-keyword">if</span> (key === <span class="hljs-string">&apos;a&apos;</span>) {
    <span class="hljs-keyword">return</span> value + <span class="hljs-number">10</span>;
  }
  <span class="hljs-keyword">return</span> value;
}

<span class="hljs-built_in">JSON</span>.parse(<span class="hljs-string">&apos;{&quot;a&quot;: 1, &quot;b&quot;: 2}&apos;</span>, f)
<span class="hljs-comment">// {a: 11, b: 2}</span>
</code></pre>
<p>&#x4E0A;&#x9762;&#x4EE3;&#x7801;&#x4E2D;&#xFF0C;<code>JSON.parse</code>&#x7684;&#x7B2C;&#x4E8C;&#x4E2A;&#x53C2;&#x6570;&#x662F;&#x4E00;&#x4E2A;&#x51FD;&#x6570;&#xFF0C;&#x5982;&#x679C;&#x952E;&#x540D;&#x662F;<code>a</code>&#xFF0C;&#x8BE5;&#x51FD;&#x6570;&#x4F1A;&#x5C06;&#x952E;&#x503C;&#x52A0;&#x4E0A;10&#x3002;</p>
<h2 id="&#x53C2;&#x8003;&#x94FE;&#x63A5;">&#x53C2;&#x8003;&#x94FE;&#x63A5;</h2>
<ul>
<li>MDN, <a href="https://developer.mozilla.org/en-US/docs/Using_native_JSON" target="_blank" rel="nofollow">Using native JSON</a></li>
<li>MDN, <a href="https://developer.mozilla.org/en-US/docs/JavaScript/Reference/Global_Objects/JSON/parse" target="_blank" rel="nofollow">JSON.parse</a></li>
<li>Dr. Axel Rauschmayer, <a href="http://www.2ality.com/2011/08/json-api.html" target="_blank" rel="nofollow">JavaScript&#x2019;s JSON API</a></li>
<li>Jim Cowart, <a href="http://freshbrewedcode.com/jimcowart/2013/01/29/what-you-might-not-know-about-json-stringify/" target="_blank" rel="nofollow">What You Might Not Know About JSON.stringify()</a></li>
<li>Marco Rogers, <a href="https://docs.nodejitsu.com/articles/javascript-conventions/what-is-json/" target="_blank" rel="nofollow">What is JSON?</a></li>
</ul>




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